aiomysql exception

gistfile1.txt

Traceback (most recent call last):
  File "/home/bruno/src/DomoPyc/venv/lib/python3.4/site-packages/aiomysql/connection.py", line 466, in _read_packet
    packet_header = yield from self._reader.readexactly(4)
  File "/usr/local/lib/python3.4/asyncio/streams.py", line 482, in readexactly
    raise IncompleteReadError(partial, len(partial) + n)
asyncio.streams.IncompleteReadError: 0 bytes read on a total of 4 expected bytes

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/bruno/src/DomoPyc/venv/lib/python3.4/site-packages/aiohttp/server.py", line 272, in start
    yield from self.handle_request(message, payload)
  File "/home/bruno/src/DomoPyc/venv/lib/python3.4/site-packages/aiohttp/web.py", line 85, in handle_request
    resp = yield from handler(request)
  File "domopyc_server.py", line 91, in power_history
    data = yield from request.app['current_cost_service'].get_history()
  File "/home/bruno/src/DomoPyc/src/web/current_cost_mysql_service.py", line 31, in get_history
    yield from cur.execute("SELECT timestamp(date(timestamp), MAKETIME(0,0,0)) AS day, "
  File "/home/bruno/src/DomoPyc/venv/lib/python3.4/site-packages/aiomysql/cursors.py", line 223, in execute
    yield from self._query(query)
  File "/home/bruno/src/DomoPyc/venv/lib/python3.4/site-packages/aiomysql/cursors.py", line 444, in _query
    yield from conn.query(q)
  File "/home/bruno/src/DomoPyc/venv/lib/python3.4/site-packages/aiomysql/connection.py", line 357, in query
    yield from self._read_query_result(unbuffered=unbuffered)
  File "/home/bruno/src/DomoPyc/venv/lib/python3.4/site-packages/aiomysql/connection.py", line 497, in _read_query_result
    yield from result.read()
  File "/home/bruno/src/DomoPyc/venv/lib/python3.4/site-packages/aiomysql/connection.py", line 688, in read
    first_packet = yield from self.connection._read_packet()
  File "/home/bruno/src/DomoPyc/venv/lib/python3.4/site-packages/aiomysql/connection.py", line 477, in _read_packet
    raise OperationalError(2006, msg % (exc,)) from exc